Senior Software Engineer (Node.js, Kafka)

Gramian Consulting; Paris; Sur place; EUR 60 000 - 85 000; Plein temps

Avantages offerts par ce poste

4-day work week

Profit-sharing and participation programs

Company restaurant

On-site gym facilities

Long-term growth opportunities

Résumé du poste

Gramian Consulting is seeking a Senior Backend Engineer in Paris to join the Poker engineering team. The successful candidate will design and develop scalable microservices for a high-traffic gaming platform, ensuring system reliability and performance.

This permanent role features a 4-day work week and offers various employee benefits, including profit-sharing, gym access, and a modern engineering culture.

Qualifications

• Significant experience in developing back-end services on high-traffic platforms (10K+ req/s).
• Proficiency in event-driven distributed architectures and cloud environments.
• DevOps culture (CI/CD, Docker, Observability) is a plus.

Responsabilités

• Design and evolve the architecture of distributed backend systems.
• Develop highly available and scalable microservices.
• Build and maintain APIs and data models.
• Implement unit, integration, and end-to-end testing.

Connaissances

Back-end services development

Event-driven distributed architectures

Load balancing

High availability

Redis or Kafka

MySQL or PostgreSQL

JavaScript and Node.js

Formation

Academic background from CPGE scientifiques

Outils

Docker

AWS

Description du poste

Gramian Consultancy is a boutique consultancy specializing in IT professional services and engineering talent solutions. With a strong background in software engineering and leadership, we help companies build high-performing teams by matching them with professionals who truly fit their needs.

About The Client

Our client is a leading player in the online gaming and betting industry, operating one of the largest poker and sports betting platforms in Europe. Their platform serves hundreds of thousands of active users monthly and relies on highly scalable, real-time distributed systems designed to handle massive traffic volumes with high availability and low latency.

The company combines strong technical excellence with a fast-moving product environment and offers engineers the opportunity to work on complex distributed architecture challenges at scale.

About The Role

We are looking for an experienced Senior Backend Engineer to join the Poker engineering team and contribute to the design, development, and optimization of highly scalable microservices powering a large-scale real-time gaming platform.

You will work on distributed, event-driven systems handling high-throughput traffic and real-time messaging workloads, while collaborating closely with infrastructure, frontend, data, and security teams.

This role is ideal for engineers passionate about backend architecture, scalability, distributed systems, and high-performance platforms.

Contract: Permanent - CDI

Model: Onsite, 4 days week!

Location: Paris, France (75007)

Key Responsibilities

• Design and evolve the architecture of distributed backend systems
• Develop highly available and scalable microservices
• Build and maintain APIs and data models
• Work on real-time event-driven systems with high throughput requirements
• Implement unit, integration, and end-to-end testing
• Participate in code reviews and technical discussions
• Deploy and maintain services in AWS environments
• Monitor, troubleshoot, and optimize platform performance
• Contribute to architecture and technical documentation
• Collaborate with Frontend, Data, Infrastructure, Security, and Product teams

Requirements

• Significant experience in developing back-end services on a high-traffic platform (10K+ req/s)
• Significant experience with load balancing, high availability, scaling, caching, database, and storage issues
• Proficiency in event-driven distributed architectures
• Proficiency in Redis or Kafka (data structures, pub/sub, streams, pipelines)
• Proficiency in relational databases (MySQL or PostgreSQL), modeling, optimization, transactions, and locks
• Knowledge of JavaScript and the Node.js ecosystem is desirable (microservices rely on Node.js)
• Knowledge of the cloud environment
• DevOps culture (CI/CD, Docker, Observability)
• Mandatory academic background from CPGE scientifiques (Maths Sup / Maths Spé)

Benefits

• Permanent full-time contract (CDI)
• 4-day work week
• Profit‑sharing and participation programs
• Company restaurant
• On‑site gym facilities
• Long‑term growth opportunities
• Modern engineering culture focused on scalability and innovation